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.button{margin-top:14px}dialog{width:min(550px,calc(100% - 30px));max-height:90vh;border:1px solid #fff;border-radius:23px;padding:0;color:var(--ink);box-shadow:0 20px 100px #18366335;background:#fff}dialog::backdrop{background:#29476745;backdrop-filter:blur(5px)}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:22px 25px 15px;border-bottom:1px solid #eef4f9}.modal-header h2{font-size:19px}.modal-header>button{background:#f4f8fb;border:0;border-radius:50%;width:30px;height:30px;display:grid;place-items:center;color:#8ba1ba}.modal-body{padding:18px 25px;max-height:65vh;overflow-y:auto}.modal-body>p{font-size:12px;color:#7b91ad}.modal-footer{display:flex;justify-content:flex-end;gap:10px;padding:16px 25px;border-top:1px solid #edf3f8}.modal-footer .button{font-size:12px}.two-fields{display:grid;grid-template-columns:1fr 1fr;gap:15px}.checkbox{font-size:12px;display:flex;align-items:center;gap:8px;color:#8ca0b9}fieldset{border:1px solid #e0ebf6;border-radius:12px;margin-top:16px;padding:12px}legend{font-size:10px;color:#849bb8;padding:0 5px}.reference-options{display:flex;flex-wrap:wrap;gap:9px;font-size:11px;color:#748eaf}.reference-options label{display:flex;align-items:center;gap:3px;padding:3px}.settings-status{display:flex;align-items:center;gap:15px}.settings-status strong{font-size:14px}.settings-status p{font-size:12px;color:#8fa1b5;margin:8px 0 0}.notice{background:#edf7ff;padding:15px;border-radius:12px;font-size:12px;line-height:1.9;color:#7593b4}.modal-body>h3{font-size:14px;margin:23px 0 10px}.event-list details{padding:10px 0;border-bottom:1px solid #eef3f8}.event-list summary{font-size:10px;cursor:pointer;overflow-wrap:anywhere}.event-list summary>span{color:#6f9ed4;margin-right:6px}.event-list summary small{color:#a0b1c2;margin-left:7px}.event-list pre{font-size:10px;background:#f7fbff;padding:10px;white-space:pre-wrap;overflow-wrap:anywhere;border-radius:8px;color:#748fae}#toast{position:fixed;bottom:28px;left:50%;transform:translate(-50%,20px);max-width:min(90vw,580px);background:#244469ed;color:white;padding:13px 22px;border-radius:13px;font-size:12px;line-height:1.8;box-shadow:0 6px 30px #18376420;opacity:0;pointer-events:none;transition:all .2s;z-index:100}#toast.visible{opacity:1;transform:translate(-50%,0)}.loading{animation:pulse 1.2s infinite;margin:10px 0 0;text-align:center}@keyframes pulse{50%{opacity:.4}}@media(min-width:1500px){.workspace{max-width:1430px}.canvas-layout{min-height:490px}.tool-rail{max-height:490px}.diagram{height:440px}.site-header{padding-left:max(32px,calc((100vw - 1380px)/2));padding-right:max(32px,calc((100vw - 1380px)/2))}}@media(max-width:1100px){.site-header{gap:15px;padding:0 25px}.site-header nav{gap:2px}.site-header nav a{padding:10px 12px;font-size:12px}.hero{padding:30px}.hero h1{font-size:39px}.hero-art{margin-left:0}.hero-figure{width:310px;left:10px}.hero-mascot{right:-5px}.task-grid{grid-template-columns:repeat(3,1fr)}.progress{margin-left:25px;margin-right:45px}.workspace-grid{gap:15px;grid-template-columns:minmax(0,1.25fr) minmax(0,1fr)}.panel{padding:17px}.panel-heading h2{font-size:19px}.question-panel .panel-heading h2{font-size:17px}.tutor-level{flex-direction:column;align-items:flex-start;gap:7px}.canvas-actions .button{font-size:10px;padding:10px 7px;gap:6px}.canvas-actions .button svg{width:16px}.canvas-hint{font-size:8px}.problem-text{padding:16px;font-size:13px}.problem-text strong{font-size:14px}.teacher-grid{grid-template-columns:280px 1fr}.tool-rail{width:65px}.geometry-panel .panel-heading .quiet{display:none}.hero-note{gap:10px;font-size:9px}}@media(max-width:800px){.site-header{height:81px;flex-wrap:wrap;gap:0;padding:0 20px;justify-content:space-between}.brand strong{font-size:26px}.brand>.mascot{width:44px;height:44px}.brand small{font-size:9px;letter-spacing:1px}.site-header nav{order:3;flex:0 0 100%;justify-content:center;padding:5px 0 7px;border-top:1px solid #f0f6fa;margin-top:6px;position:absolute;top:75px;left:0;right:0;background:#fffffff5}.site-header nav a{font-size:11px;padding:7px 15px}.site-header nav svg{width:14px;height:14px}.mode-badge{font-size:9px;padding:8px 10px}.mode-badge>svg{display:none}main{padding:54px 20px 35px}.hero{min-height:360px;padding:25px}.hero h1{font-size:33px}.hero-art{height:290px}.hero-figure{width:260px;height:230px;left:0;top:25px;padding:5px 20px 20px}.hero-figure .diagram{height:190px}.hero-mascot .mascot{width:95px;height:95px}.hero-mascot{right:-5px;bottom:0}.float-note{font-size:8px;padding:10px}.float-note.top{right:0;top:0}.float-note.bottom{left:0;bottom:-8px}.hero-copy>p{font-size:12px}.hero-actions{flex-wrap:wrap;gap:9px}.hero-actions .button{font-size:11px;padding:10px 15px}.hero-note{flex-wrap:wrap;gap:8px;max-width:230px}.section-title h2{font-size:21px}.task-grid{grid-template-columns:repeat(2,1fr)}.workspace{padding-top:60px}.progress{margin:0 0 25px;padding:0}.progress-quote{display:none}.progress-track{left:30px;right:30px}.progress button{width:75px}.progress button strong{font-size:10px}.workspace-grid{grid-template-columns:1fr 1fr;gap:12px}.panel{padding:15px;border-radius:18px}.workspace-title>span{font-size:9px}.canvas-layout{min-height:340px}.tool-rail{max-height:350px;width:55px;padding:5px;gap:6px}.tool-rail button{min-height:58px;font-size:8px}.tool-rail button svg{width:21px;height:21px}.diagram{height:290px}.canvas-hint{padding:9px;font-size:8px}.canvas-actions{flex-wrap:wrap;gap:7px}.canvas-actions .button{min-width:45%}.canvas-actions .button:last-child{flex-basis:100%}.panel-heading h2{font-size:17px}.heading-icon{width:34px;height:34px}.hint-content{padding:13px 11px;gap:9px}.hint-content p{font-size:11px}.hint-content strong{font-size:12px}.bulb{width:28px;height:28px}.tutor-panel .mascot{width:53px;height:53px}.tutor-welcome{margin:17px 0;gap:10px}.tutor-welcome .mascot{width:61px;height:61px}.tutor-welcome strong{font-size:10px}.tutor-welcome p{font-size:9px}.question-panel .panel-heading .mascot{width:43px;height:43px}.question-panel .panel-heading h2{font-size:15px}.hint-scale{gap:6px}.hint-scale small{font-size:8px}.question-actions{flex-wrap:wrap}.options button{font-size:10px;gap:10px;padding:11px}.hint-diagram{height:160px;padding:5px 10px 18px}.hint-diagram .diagram{height:137px}.proof-footer{flex-wrap:wrap}.teacher-page{padding-top:63px}.teacher-metrics{grid-template-columns:repeat(2,1fr)}.teacher-grid{grid-template-columns:240px 1fr;gap:15px}.evidence-detail{padding:19px}.summary-page{padding-top:67px}.summary-stats>div{padding:0 17px}.summary-stats strong{font-size:20px}.summary-stats small{font-size:9px}.summary-grid{gap:15px}.summary-grid .panel{padding:20px}.section-title .search-box input{width:135px}.learning-note{padding:15px;gap:13px}.learning-note>.tag{display:none}.workspace-title>a{font-size:9px}.workspace-title>button{font-size:9px}.workspace-title{gap:8px}.panel-actions{flex-wrap:wrap}}@media(max-width:600px){main{padding-left:15px;padding-right:15px}.site-header{padding:0 15px}.brand small{font-size:8px}.brand strong{font-size:24px}.hero{display:flex;flex-direction:column;padding:30px 25px 20px;margin-bottom:32px;align-items:stretch;border-radius:24px}.hero h1{font-size:36px}.hero-copy>p br{display:none}.hero-copy>p{margin-bottom:20px}.hero-note{max-width:100%;font-size:9px;gap:12px;margin-top:21px}.hero-art{height:230px;margin:25px 0 0}.hero-figure{left:15%;width:230px;height:205px;top:10px}.hero-figure .diagram{height:165px}.hero-mascot{right:0;bottom:2px}.float-note.top{top:0;right:5px}.float-note.bottom{bottom:0;left:0;font-size:8px}.d1{top:4px;left:0}.d2{right:0;top:70px}.section-title{flex-direction:column;align-items:flex-start;gap:17px}.section-title h2{font-size:20px}.section-title .eyebrow{font-size:8px;margin-bottom:10px}.section-title .search-box{width:100%}.section-title .search-box input{width:100%}.filters{gap:4px;margin-top:18px}.filters button{font-size:10px;padding:7px 10px}.filters>span{font-size:9px;margin:5px 0 0 auto}.task-grid{gap:11px}.task-card{padding:14px 12px 0;border-radius:17px}.task-card h3{font-size:13px}.task-card>p{font-size:9px}.task-figure{height:120px;margin:12px 0 7px}.task-top .tag{font-size:8px;padding:4px 7px}.difficulty{font-size:8px}.task-bottom>span{font-size:8px}.task-bottom>span svg{width:11px}.learning-note strong{font-size:11px}.learning-note p{font-size:9px}.learning-note .mascot{width:43px;height:43px}.workspace-grid{display:flex;flex-direction:column;gap:16px}.left-column,.right-column{width:100%}.right-column{gap:15px}.canvas-layout{min-height:360px}.tool-rail{width:59px;max-height:380px}.tool-rail button{min-height:61px;font-size:9px}.diagram{height:310px}.panel{padding:17px;border-radius:19px}.problem-panel .panel-heading h2,.geometry-panel .panel-heading h2{font-size:21px}.canvas-actions{flex-wrap:nowrap}.canvas-actions .button{min-width:0;font-size:9px;padding:10px 7px}.canvas-actions .button:last-child{flex-basis:auto}.canvas-actions .button svg{width:15px}.canvas-bottom{font-size:8px;padding:9px}.progress button{width:54px}.progress button strong{font-size:9px}.progress button>span{width:30px;height:30px;font-size:15px}.progress-track{top:14px;left:18px;right:18px}.workspace-title{margin-bottom:13px;flex-wrap:wrap}.workspace-title>span{order:3;flex:0 0 100%;font-size:9px}.workspace-title>button{margin-left:auto}.tutor-level{flex-direction:row;align-items:center}.level-pill{font-size:11px;padding:7px 10px}.hint-content p{font-size:13px}.hint-content strong{font-size:14px}.tutor-panel .panel-heading h2{font-size:21px}.tutor-welcome strong{font-size:12px}.tutor-welcome p{font-size:10px}.question-panel .panel-heading h2{font-size:18px}.options button{font-size:12px;min-height:46px}.hint-diagram{height:200px}.hint-diagram .diagram{height:175px}.diagnosis-actions button{font-size:10px}.gentle-note{padding:8px}.proof-footer{flex-wrap:nowrap}.summary-hero h1{font-size:27px}.summary-hero>.mascot{width:90px;height:90px}.summary-stats{grid-template-columns:1fr 1fr;gap:22px 0}.summary-stats>div:nth-child(2){border:0}.summary-grid{grid-template-columns:1fr}.summary-actions{gap:8px}.summary-actions .button{font-size:10px;padding:11px 13px}.teacher-page .section-title h1{font-size:26px}.teacher-metrics{gap:11px;margin-top:20px}.teacher-metrics .panel{padding:17px;gap:9px}.teacher-metrics small{font-size:8px}.evidence-categories{gap:12px;font-size:10px}.teacher-grid{grid-template-columns:1fr}.session-list{max-height:270px;overflow-y:auto}.evidence-detail{padding:20px}.teacher-page .section-title .button{min-height:38px;font-size:11px}.two-fields{gap:10px}.modal-header{padding:20px}.modal-body{padding:15px 20px}.modal-footer{padding:15px 20px}footer{padding:17px 20px 25px;flex-direction:column;align-items:center;gap:8px;font-size:9px}.canvas-hint{font-size:9px}.hero-note span{white-space:nowrap}}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important;scroll-behavior:auto!important}}@media print{.site-header,footer,.button,.tool-rail,.canvas-actions,.progress,.workspace-title{display:none}body{background:white}main{padding:0}.panel{border:1px solid #ddd;box-shadow:none;break-inside:avoid}.workspace-grid,.summary-grid,.teacher-grid{display:block}.right-column{margin-top:20px}}
/* Guided constructions keep object selection and exact constraints together. */
.construction-guide{background:linear-gradient(120deg,#f0f8ff,#f7f3ff);border:1px solid #dbeafa;border-radius:16px;padding:15px;margin:0 0 13px}.guide-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px}.guide-heading strong{display:flex;align-items:center;gap:8px;font-size:13px;color:#5087c9}.guide-heading>button{border:0;background:transparent;color:#89a1bd;padding:4px}.guide-modes{display:flex;gap:7px;margin-bottom:13px}.guide-modes button{background:white;border:1px solid #dfe8f5;border-radius:9px;padding:8px 10px;font-size:10px;color:#8198b5;flex:1}.guide-modes button.active{background:#e9f3ff;color:#417dd0;border-color:#9dc7fb}.guide-steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px}.guide-steps button{display:flex;align-items:center;gap:7px;min-width:0;text-align:left;background:#fff9;border:1px solid #e0e9f5;border-radius:10px;padding:9px 7px;color:#91a4bc}.guide-steps button.active{background:#fff;border-color:#81b5f7;box-shadow:0 0 0 2px #e0efff}.guide-steps button>span{width:21px;height:21px;display:grid;place-items:center;flex-shrink:0;border-radius:50%;background:#eaf1fa;color:#8da9cd;font-size:10px}.guide-steps button.done>span{color:#fff;background:#69bda5}.guide-steps button>div{min-width:0;display:flex;flex-direction:column;gap:4px}.guide-steps small{font-size:8px;line-height:1.6;white-space:normal}.guide-steps b{font-size:12px;line-height:1.4;color:#5079ac}.guide-prompt{font-size:12px;color:#4e759f;line-height:1.8;margin:13px 0 10px}.guide-pick{display:flex;align-items:center;gap:12px;font-size:10px;color:#8fa4bd}.guide-pick select,.guide-config input,.guide-config select{background:white;border:1px solid #d5e5f7;border-radius:8px;padding:8px;color:#4774a4;font:inherit;min-width:0}.guide-pick select{flex:1;max-width:175px}.guide-config{display:flex;flex-wrap:wrap;align-items:flex-end;gap:12px;margin:15px 0 12px}.guide-config label{display:flex;flex-direction:column;gap:7px;font-size:10px;color:#7b94b4;flex:1;min-width:90px}.guide-config label:first-child{flex:0 0 83px}.guide-config input{width:100%}.guide-preview{padding:12px 14px;background:#fff;border:1px solid #dfebfa;border-radius:11px;color:#7195bc}.guide-preview strong{font-size:10px;color:#9170d2}.guide-preview p{font-size:12px;line-height:1.8;margin:6px 0}.guide-preview small{font-size:9px;color:#95a7bf}.guide-preview.invalid{background:#fff9ed;border-color:#f3e4cb}.guide-preview.invalid strong{color:#c69c58}.guide-confirm{display:flex;justify-content:flex-end;gap:10px;margin-top:12px}.guide-footnote{font-size:9px;color:#99adc5;line-height:1.8;margin:12px 0 0}@media(max-width:1100px){.guide-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.guide-steps small{font-size:9px}}@media(max-width:600px){.construction-guide{padding:12px}.guide-steps{grid-template-columns:repeat(2,minmax(0,1fr))}.guide-config{gap:8px}.guide-config label{font-size:9px}.guide-preview p{font-size:11px}.guide-heading strong{font-size:12px}}

/* Two visible tool groups above the canvas. */
.geometry-tools{display:grid;gap:8px;margin-bottom:12px}
.tool-row{display:flex;align-items:center;gap:10px;padding:9px 10px;border:1px solid #dceaff;border-radius:13px;background:#f4f8ff}
.tool-row-label{flex:0 0 64px;font-size:11px;color:#537ba7}
.tool-row-buttons{display:flex;flex-wrap:wrap;gap:6px;flex:1;min-width:0}
.tool-row button{display:flex;align-items:center;justify-content:center;gap:5px;min-height:36px;padding:7px 9px;border:1px solid #dce7f8;border-radius:9px;background:white;color:#416eaa;font-size:11px;white-space:nowrap}
.tool-row button.active{background:#dfeeff;border-color:#78b2ff;box-shadow:0 0 0 1px #78b2ff}
.construction-tools{background:#f0faf6;border-color:#d6ede4}
.construction-tools .tool-row-label{color:#378272}
.construction-tools button{border-color:#d2e9df;color:#327a68}
.construction-tools button.active{background:#d8f3e7;border-color:#60bda0;box-shadow:0 0 0 1px #60bda0}
.tool-row .danger-tool{color:#b54a5b;background:#fff4f5;border-color:#f2cbd1;margin-left:auto}
.tool-row .danger-tool.active{background:#ffe1e6;border-color:#df8797;box-shadow:0 0 0 1px #df8797}
.geometry-panel .canvas-layout{display:block;min-height:0}
.canvas-wrap{width:100%;min-width:0}
.auxiliary-list{margin-top:12px;border:1px solid #e0eaf4;border-radius:11px;padding:10px 12px;font-size:12px}
.auxiliary-list summary{cursor:pointer;color:#527498}
.auxiliary-list summary span{font-size:10px;color:#8599af;margin-left:10px}
.auxiliary-list>div{display:grid;gap:5px;margin-top:10px;max-height:180px;overflow:auto}
.auxiliary-item{display:flex;justify-content:space-between;gap:8px;border-radius:8px;background:#f6fafc}
.auxiliary-item.selected{background:#eee8ff}
.auxiliary-item button{display:flex;align-items:center;gap:6px;background:transparent;border:0;padding:9px;color:#527498;font-size:11px}
.auxiliary-item .remove-aux{color:#b54a5b}
.tool-row button:focus-visible,.auxiliary-item button:focus-visible{outline:2px solid #498de0;outline-offset:2px}
@media(max-width:1100px){.tool-row{align-items:flex-start;flex-direction:column;gap:6px}.tool-row-label{flex:auto}.tool-row-buttons{width:100%}.tool-row button{font-size:10px;padding:6px 8px}}
@media(max-width:600px){.tool-row{padding:8px}.tool-row button{min-height:38px}.auxiliary-list summary span{display:block;margin:5px 0 0}}
@media print{.geometry-tools,.auxiliary-list{display:none}}
.construction-tools .tool-row-buttons{display:grid;grid-template-columns:repeat(8,minmax(0,1fr))}
.construction-tools button{flex-direction:column;gap:5px;padding:7px 2px;font-size:10px;white-space:normal;text-align:center}
@media(max-width:800px){.construction-tools .tool-row-buttons{grid-template-columns:repeat(4,minmax(0,1fr))}}

.segment-reference{display:inline;padding:0 4px;margin:0 1px;border:0;border-bottom:1px solid #86b5e5;border-radius:4px;background:#e6f1ff;color:#285d9b;font:inherit;font-weight:600;line-height:inherit;cursor:pointer}
.segment-reference.marked{color:#a65b09;background:#ffe3b6;border-color:#edaa49}
.segment-reference.unconnected{background:transparent;border-bottom:1px dashed #9baac0;color:inherit}
.segment-reference:focus-visible{outline:2px solid #498de0;outline-offset:2px}
.annotation-controls{display:flex;align-items:center;flex-wrap:wrap;gap:8px 12px;margin:0 0 12px;font-size:10px;color:#7d90a9}
.annotation-controls button{display:flex;align-items:center;gap:5px;background:#f5f9ff;border:1px solid #e1ebf7;border-radius:7px;padding:6px 8px;color:#537ca8;font-size:10px}
.annotation-controls span{display:flex;align-items:center;gap:5px}.mark-dot{display:inline-block;width:8px;height:8px;border-radius:50%;background:#579cff}.mark-dot.manual{background:#f6a23b}

.mark-dot.hint{background:#9862ec}
.hint-focus{display:flex;align-items:center;flex-wrap:wrap;gap:6px;margin:9px 0 12px;padding:8px 10px;background:#f6f0ff;border-radius:10px;color:#8558b6;font-size:11px}
.hint-focus b{padding:3px 6px;border-radius:5px;background:#e9ddff;letter-spacing:.5px}
.hint-focus small{color:#9580af;font-size:9px;margin-left:auto}
/* Persistent geometry and reasoning workspace */
.revised-workspace{max-width:1440px;margin:auto;padding-bottom:90px}.work-modes{display:flex;gap:6px;flex-wrap:wrap}.work-modes button{padding:9px 14px;border:1px solid #dae5ec;border-radius:12px;background:white;color:#35536d}.work-modes .active{background:#e8f2ff;border-color:#85b2ed;color:#2358a0}.revised-grid{grid-template-columns:minmax(0,1.15fr) minmax(340px,.85fr);align-items:start}.persistent-canvas .canvas-wrap{position:relative;min-height:350px}.persistent-reasoning{display:grid;gap:16px;min-width:0}.current-task .task-body{max-height:340px;overflow:auto;padding:8px 24px 22px}.flow-options{border:0;padding:0;display:grid;gap:8px}.flow-option{display:flex;align-items:start;gap:8px;padding:10px;border:1px solid #dce6ee;border-radius:10px;background:#f8fbff}.flow-option input{margin-top:4px}.visible-constraints{padding:12px;background:#f0f7f5;border-radius:12px;margin:12px}.visible-constraints div{display:flex;justify-content:space-between;gap:8px}.visible-constraints small{display:block;color:#88612e}.workspace-submit{position:sticky;bottom:0;z-index:5;display:flex;gap:12px;align-items:center;padding:15px;background:#fffffff2;border-top:1px solid #dae5ec;backdrop-filter:blur(8px)}.student-timeline{max-height:260px;overflow:auto}.relation-tools{display:flex;flex-wrap:wrap;gap:6px}.class-aggregation,.evidence-states{padding:24px;margin:20px 0}.revised-workspace .workspace-title{flex-wrap:wrap}.current-task details{margin:10px 0}.current-task summary{cursor:pointer}.persistent-reasoning .proof-list{max-height:420px;overflow:auto}.advanced-object-list{padding:12px}.evidence-states p{margin:8px 0}
@media(max-width:850px){.revised-grid{grid-template-columns:minmax(0,1fr) minmax(290px,.9fr)}.workspace-submit .quiet{display:none}.revised-workspace{padding:12px}.current-task .task-body{padding:10px;max-height:300px}.work-modes button{padding:7px}}
@media(max-width:640px){.revised-grid{grid-template-columns:1fr}.persistent-canvas .canvas-wrap{min-height:230px}.current-task .task-body{max-height:none}.workspace-submit{flex-wrap:wrap}.work-modes{width:100%}.persistent-reasoning .proof-list{max-height:none}}
.revised-grid{display:grid}.persistent-canvas .diagram{display:block;width:100%;height:clamp(260px,42vh,440px)}.persistent-canvas .canvas-wrap{min-height:0}.work-modes{margin-left:auto}.workspace-submit{border-radius:14px;margin-top:18px}.revised-workspace .proof-panel{padding:22px}.current-task .task-body .button{margin:4px}.visible-constraints h3{font-size:14px}.visible-constraints span{font-size:12px}.persistent-canvas .problem-text{padding:14px 18px}.persistent-canvas .canvas-hint{padding:8px 12px}
@media(max-width:640px){.work-modes{margin-left:0}.persistent-canvas .diagram{height:280px}.revised-workspace .proof-panel{padding:16px}.workspace-submit .button{padding:10px 12px}.revised-workspace .workspace-title{gap:10px}}
/* One continuous workbench, one cognitive task */
.revised-workspace .workspace-title>[data-action="open-records"]{margin-left:auto}.tool-operation{padding:10px 12px;margin:10px 0;border-radius:12px;background:#f6fafc;border:1px solid #e0eaf2}.tool-operation>p{font-size:12px;color:#6a829b;margin:0}.tool-operation .construction-guide{margin:0}.current-task-label{font-size:14px;font-weight:650;padding:0 24px 10px;color:#567497}.global-actions{display:grid;grid-template-columns:1fr 1fr 1fr;position:sticky;bottom:0}.global-actions>button:first-child{justify-self:start}.global-actions>[data-action="difficulty"]{justify-self:center}.global-actions>[data-action="attempt"]{justify-self:end}.task-attention{animation:task-attention 1.1s ease-out}.records-drawer{position:fixed;z-index:30;right:0;top:0;bottom:0;width:min(440px,43vw);padding:26px;background:white;border-left:1px solid #d7e6ee;box-shadow:-12px 0 30px #204e7924;overflow:auto}.drawer-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:18px}.records-drawer .student-timeline{max-height:none;overflow:visible}.records-drawer article{border-bottom:1px solid #e4edf3;padding:12px 0}.records-drawer article p{margin:5px 0;font-size:13px}.records-drawer small{color:#758aa1}.current-task h3{font-size:16px;line-height:1.6}.current-task textarea{min-height:90px}@keyframes task-attention{0%,35%{box-shadow:0 0 0 4px #8abaf9}100%{box-shadow:0 0 0 0 transparent}}@media(max-width:640px){.records-drawer{width:min(360px,90vw);padding:18px}.global-actions{gap:6px;padding:10px 5px}.global-actions .button{padding:8px 9px;font-size:11px}.current-task-label{padding:0 12px 8px}}
.persistent-canvas .diagram{flex:none;min-height:0;max-height:440px}.diagnosis-task .task-body{max-height:min(560px,62vh)}body:has(.revised-workspace) #toast{bottom:110px}@media(max-width:640px){.diagnosis-task .task-body{max-height:none}.persistent-canvas .diagram{max-height:280px}}
.pending-task-notice{grid-column:1/-1;display:flex;align-items:center;gap:12px;padding:0 2px;border-bottom:1px solid #e3edf7;margin-bottom:4px}.pending-task-notice .text-button{color:#386baa;font-size:12px;font-weight:650;padding-left:0}.pending-task-notice>span{font-size:12px;color:#72839b}.global-actions .pending-task-notice{justify-self:stretch}.global-actions .pending-task-notice+button{justify-self:start}.submission-subdued{box-shadow:none;background:#f0f5fa;color:#71859e;border-color:#dce5ee}.submission-subdued:disabled{opacity:.7}body:has(.has-pending-task) #toast{bottom:150px}@media(max-width:640px){.pending-task-notice{gap:8px;flex-wrap:wrap}.pending-task-notice>span{font-size:11px}}

/* Focused reasoning editor: main inputs first, optional detail on demand. */
dialog.proof-editor-dialog{width:min(700px,calc(100% - 28px));border-radius:24px;max-height:92dvh}.proof-editor-dialog .modal-header{padding:26px 30px 22px}.proof-editor-dialog .modal-header h2{font-size:25px;color:#15366b}.proof-editor-dialog .modal-header>button{width:38px;height:38px;color:#668ab7;background:#f2f8ff}.proof-editor-dialog .modal-body{padding:24px 30px;max-height:calc(92dvh - 182px)}.proof-main-field{font-size:17px!important;font-weight:650;color:#173a70!important;gap:11px!important;margin:0 0 14px!important}.required-mark{color:#e35c68}.proof-editor .field textarea{min-height:80px;border:1.5px solid #d5e3f5;border-radius:12px;padding:15px 16px;background:#fbfdff;font-size:15px;line-height:1.7;resize:vertical}.proof-editor .field input,.proof-editor .field select{border-color:#d5e3f5;background:#fbfdff}.proof-symbols{display:flex;flex-wrap:wrap;gap:7px;margin:0 0 26px}.proof-symbols>.button{font-size:20px;min-width:43px;padding:7px 10px;min-height:43px;color:#2465b0}.proof-more-symbols{position:relative}.proof-more-symbols summary,.proof-objects>summary{list-style:none;cursor:pointer;border:1.5px solid #d5e3f5;border-radius:12px;background:#f5faff;color:#326fb9;padding:11px 15px;font-size:13px;font-weight:600}.proof-more-symbols summary::-webkit-details-marker,.proof-objects>summary::-webkit-details-marker{display:none}.proof-more-symbols>div{display:flex;gap:6px;flex-wrap:wrap;padding-top:8px}.proof-citations{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:24px}.proof-citations>span{font-size:12px;color:#5378a8;font-weight:600}.proof-citations select{min-width:95px;max-width:100%;flex:1;border:1px solid #d5e3f5;border-radius:11px;background:#f5faff;padding:10px;color:#416992;font-size:12px}.proof-advanced{border:1px solid #e1ebf8;border-radius:14px;background:linear-gradient(125deg,#fbfdff,#f8fbff);padding:15px 18px;margin-bottom:19px}.proof-advanced>summary{cursor:pointer;font-size:16px;font-weight:650;color:#20436f}.proof-advanced .two-fields{margin-top:20px}.proof-advanced .field{font-size:13px;color:#6181aa}.proof-advanced fieldset{margin-top:10px}.proof-dependency{display:flex;gap:8px;align-items:flex-start;font-size:12px;line-height:1.7;margin:7px 0;overflow-wrap:anywhere}.proof-dependency input{flex-shrink:0}.proof-objects>summary{display:inline-flex;align-items:center;gap:8px;color:#287aec}.proof-objects>p{margin:12px 0 8px}.proof-object-list{display:flex;flex-wrap:wrap;gap:7px;max-height:150px;overflow-y:auto;padding:4px}.proof-angle{display:flex;flex-wrap:wrap;align-items:center;gap:7px;margin-top:12px;font-size:12px}.proof-angle select{padding:9px 7px;border:1px solid #d5e3f5;border-radius:8px;max-width:100%;background:#fbfdff;color:#416992}.proof-shortcut{font-size:11px;color:#8b9db6;margin:18px 0 0;text-align:right}.proof-editor-dialog .modal-footer{padding:18px 30px;gap:12px}.proof-editor-dialog .modal-footer .button{font-size:15px;min-width:105px;padding:13px 22px}.proof-editor-dialog .modal-footer .primary{min-width:140px}@media(max-width:600px){.proof-editor-dialog .modal-header{padding:20px}.proof-editor-dialog .modal-header h2{font-size:20px}.proof-editor-dialog .modal-body{padding:18px;max-height:calc(92dvh - 165px)}.proof-main-field{font-size:15px!important}.proof-editor .field textarea{font-size:14px}.proof-symbols{gap:6px}.proof-symbols>.button{min-width:38px;min-height:39px;padding:6px 9px}.proof-advanced{padding:13px}.proof-advanced .two-fields{grid-template-columns:1fr;gap:0}.proof-editor-dialog .modal-footer{padding:15px 18px}.proof-citations .small-button{padding:8px 11px}.proof-citations>span{width:100%}}
.proof-main-field{display:block!important}.proof-main-field>textarea{display:block;width:100%;margin-top:11px;font-weight:400}.proof-main-field>.required-mark{display:inline;margin-left:4px}

.has-pending-task .pending-task-notice{background:#fff1f2;border:1px solid #f5b8c0;border-left:4px solid #d7354f;border-radius:10px;padding:3px 12px;margin-bottom:6px}.has-pending-task .pending-task-notice .text-button{color:#b4233e;font-size:14px;font-weight:750;min-height:38px}.has-pending-task .pending-task-notice .text-button:hover{background:#ffe1e6}.has-pending-task .pending-task-notice>span{color:#a92c42;font-weight:600}

.scratch-panel .panel-heading{margin-bottom:13px}.scratch-panel .panel-heading h2{font-size:20px}.scratch-panel .panel-heading>.quiet{font-size:11px;white-space:nowrap}.scratch-panel textarea{display:block;width:100%;min-height:190px;resize:vertical;border:1px solid #dbe9f2;border-radius:13px;padding:16px;background:linear-gradient(#fbfefd,#f7fcfa);color:var(--ink);font-size:14px;line-height:1.9}.scratch-panel textarea::placeholder{color:#9aabb9}@media(max-width:640px){.scratch-panel .panel-heading{gap:9px}.scratch-panel .panel-heading h2{font-size:18px}.scratch-panel textarea{min-height:170px}}
#plan-message{color:#306aa4;background:#f2f8ff;border-radius:10px;padding:12px;font-size:13px;min-height:44px}#plan-message a{color:#216cce;text-decoration:underline}#modal [data-action^="plan-"]{margin:4px 6px 8px 0}
.inline-proof-editor{margin-top:20px;border:1px solid #d5e7fa;border-radius:16px;padding:20px;background:#f8fbff}.inline-proof-editor h3{font-size:18px}.inline-proof-editor #proof-text{min-height:95px;font-size:19px;background:white;border:2px solid #b9d8fb}.proof-facts{margin:18px 0}.fact-chips,.fact-actions,.scratch-actions{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0}.fact-chip{background:#e5f0ff;border:1px solid #c4ddfa;border-radius:20px;font-size:12px;text-align:left}.fact-picker{display:grid;gap:8px;padding:12px;background:white;border-radius:12px;max-height:220px;overflow:auto}.fact-picker button{text-align:left;white-space:normal}.inline-proof-actions{display:flex;justify-content:flex-end;gap:10px}.math-keyboard{display:flex;align-items:center;flex-wrap:wrap;gap:6px;padding:14px;border:1px solid var(--border);border-radius:14px;background:white;position:relative}.math-keyboard>span{font-size:12px;color:var(--muted);width:100%}.math-keyboard details{position:relative}.math-keyboard summary{cursor:pointer;font-size:12px}.math-keyboard details[open]{display:flex;flex-wrap:wrap;gap:4px}.geometry-input-mode{display:flex;flex-wrap:wrap;gap:8px;padding:12px;background:#eaf4ff;border:1px solid #b9d8fb;border-radius:12px}.geometry-input-mode>span{width:100%;font-size:12px}.proof-card{position:relative;flex-wrap:wrap}.proof-card>button{font-size:12px}.proof-cited-facts{font-size:12px;color:#637998}.inline-proof-editor .proof-advanced{margin:16px 0}.persistent-canvas{position:sticky;top:12px;align-self:start}@media(max-width:760px){.persistent-canvas{position:relative;top:auto}.inline-proof-editor{padding:14px}.math-keyboard{position:relative}}
.geometry-input-mode button[aria-pressed="true"]{background:#d4e8ff;border-color:#3887fb}
@media(min-width:761px){.persistent-canvas{max-height:calc(100dvh - 160px);overflow:auto;overscroll-behavior:contain;scrollbar-gutter:stable}.persistent-canvas .diagram{height:clamp(220px,36dvh,340px)}}
.theorem-results{display:flex;flex-wrap:wrap;gap:8px}.theorem-results:empty{display:none}

.diagram text{fill:#222222}.diagram .geometry-point text{fill:inherit}.diagram .geometry-point{color:#222222}.mark-dot{background:#222222}.mark-dot.manual,.mark-dot.hint{background:#2878d0}.segment-reference.marked{background:#e7f0fc;color:#2878d0}.auxiliary-item.selected{background:#e7f0fc}.canvas-wrap{background:transparent}

.math-tools-heading{width:100%;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:8px;font-size:13px}.math-tools-heading span{font-size:12px;color:var(--muted)}.math-keyboard .math-tools-help{font-size:11px;line-height:1.6}.math-keyboard>details{margin-left:4px}
/* Keep the figure visible while the student writes; remove nested proof/task scrolling. */
.current-task .task-body,.diagnosis-task .task-body{max-height:none;overflow:visible}.persistent-reasoning .proof-list{max-height:none;overflow:visible}
.advanced-inline{padding:12px;border:1px solid #c9ddec;border-radius:12px;background:#f8fbff}.advanced-inline .field{margin:8px 0}.advanced-pick-row{display:flex;gap:6px;align-items:center}.advanced-pick-row select{flex:1;min-width:0}.advanced-candidates{display:flex;gap:8px;flex-wrap:wrap}.advanced-inline>div>.button{margin:4px}.explanation-question h3{font-size:15px}
@media(min-width:761px){.persistent-canvas{max-height:none;overflow:visible;top:8px}.persistent-canvas .diagram{height:clamp(180px,30dvh,290px)}.persistent-canvas .problem-text{padding:8px 12px}.persistent-canvas .tool-operation p{margin:5px}.persistent-canvas .canvas-hint{padding:4px 8px}.geometry-tools button{padding:6px}.persistent-canvas .annotation-controls{padding:4px 8px}.persistent-canvas .tool-row{padding:6px}.persistent-canvas .tool-operation{margin:6px 0}}
@media(max-width:760px){.persistent-canvas{position:sticky;top:0;z-index:4;background:white;max-height:40dvh;overflow:auto;border:1px solid #d9e6ed}.persistent-canvas .diagram{height:180px;max-height:none}.persistent-canvas .geometry-tools,.persistent-canvas .annotation-controls,.persistent-canvas .tool-operation,.persistent-canvas .advanced-inline,.persistent-canvas .auxiliary-list,.persistent-canvas .visible-constraints{font-size:12px}.persistent-canvas:has(.advanced-inline),.persistent-canvas:has(.guide-panel){position:relative;max-height:none}.persistent-reasoning{padding-top:8px}.revised-workspace .workspace-grid{grid-template-columns:1fr}}
.mobile-reference{display:none}
@media(max-width:760px){.persistent-canvas{position:relative;max-height:none;overflow:visible;z-index:auto}.mobile-reference{display:block;position:sticky;top:0;z-index:4;background:#fff;border:1px solid #d4e3ee;border-radius:12px;padding:4px 10px}.mobile-reference summary{font-size:13px;cursor:pointer}.mobile-reference summary .button{float:right;padding:0 8px;font-size:11px}.mobile-reference .diagram{height:155px;width:100%;display:block;margin:0;pointer-events:none}.mobile-reference .diagram text{font-size:20px}.inline-proof-editor #proof-text,#free-scratch{scroll-margin-top:200px}.math-keyboard{position:sticky;bottom:72px;z-index:3;padding:8px}.math-keyboard .math-tools-help{display:none}}
/* Compact editing stays at the top of the reasoning workspace. */
.compact-proof-editor{margin:12px 0;padding:14px;scroll-margin-top:12px}.compact-proof-editor h3{margin:0 0 10px;font-size:15px}.compact-proof-editor .field{margin:8px 0;font-size:13px}.compact-proof-editor #proof-text,.compact-proof-editor #proof-basis{min-height:58px;height:58px;font-size:15px;padding:9px;resize:vertical}.compact-input-tools{display:flex;flex-wrap:wrap;gap:6px;margin:10px 0}.compact-input-tools .button{min-height:32px;padding:5px 10px}.compact-proof-editor .inline-proof-actions{align-items:center;margin-top:10px;flex-wrap:wrap}.inline-proof-actions small{margin-right:auto;font-size:10px;color:#6a809b}.compact-proof-editor .inline-proof-actions .button{min-height:36px;padding:7px 14px}.compact-proof-editor .proof-facts{margin:8px 0}.compact-proof-editor .proof-advanced{padding:10px;margin:8px 0}.compact-proof-editor .math-keyboard{position:relative;bottom:auto;padding:8px}.proof-draft-summary{border:1px solid #b9d8fb;background:#f8fbff;border-radius:12px;padding:12px;margin:12px 0;overflow-wrap:anywhere}.proof-draft-summary p{margin:5px 0;font-size:13px}.proof-panel.is-editing .proof-cited-facts,.proof-panel.is-editing .proof-object-associations,.proof-panel.is-editing .proof-status{display:none}.proof-panel.is-editing .proof-card{padding:8px 10px;gap:8px}.proof-panel.is-editing .proof-card p{margin:3px 0;font-size:11px}.proof-card{cursor:pointer}.scratch-input-tools>summary{font-size:12px;cursor:pointer;padding:8px 0;color:#5078ae}.help-context{font-size:13px;background:#f5f9ff;border-radius:9px;padding:9px;overflow-wrap:anywhere}.compact-proof-editor .fact-chip{white-space:normal}.compact-proof-editor .theorem-results:empty{display:none}
@media(max-width:760px){.compact-proof-editor{scroll-margin-top:190px;padding:10px}.compact-proof-editor .inline-proof-actions small{width:100%}.compact-proof-editor .math-keyboard{position:relative;bottom:auto}.scratch-input-tools .math-keyboard{position:relative;bottom:auto}}

/* Hint drawings are temporary, code-rendered views; motion ends without changing geometry. */
.hint-visual{margin:12px 0;background:#f4f8ff;border:1px solid #dce7f5;border-radius:12px;overflow:hidden}.hint-visual svg{display:block;width:100%;max-height:290px}.hint-visual text{fill:#24416a;stroke:none;font-size:18px}.hint-visual figcaption{padding:8px 12px;color:#526b88;font-size:12px}.hint-follow-up{border-left:3px solid #2878d0;padding-left:12px;font-weight:600}.hint-actions{display:flex;flex-wrap:wrap;gap:8px}.review-step{border-left:3px solid #77a5dc;padding:8px 14px;margin:12px 0}.review-step p{margin:6px 0}.review-issue{color:#8a4d22}.mathematical-report{margin:20px 0}.understanding-check{padding:12px;background:#f2faf6;border-radius:10px}.hint-part{transform-box:fill-box;transform-origin:center}
.hint-motion-pulse .hint-part{animation:hint-pulse 1.2s ease-in-out 3}.hint-motion-highlight .hint-part{animation:hint-pulse 1.5s ease-in-out 2}.hint-motion-dim_others .hint-part{animation:hint-pulse 1.5s ease-in-out 2}.hint-motion-zoom_region .hint-part{animation:hint-zoom 4s ease-in-out 1}.hint-motion-separate_selected .hint-part-0{animation:hint-left 5s ease-in-out 1}.hint-motion-separate_selected .hint-part-1{animation:hint-right 5s ease-in-out 1}.hint-motion-rotate_selected .hint-part{animation:hint-rotate 5s ease-in-out 1}.hint-motion-translate_selected .hint-part,.hint-motion-compare_side_by_side .hint-part{animation:hint-position 5s ease-in-out 1}.hint-motion-overlay_selected .hint-part-1{animation:hint-position 5s ease-in-out 1}.hint-motion-trace_path .hint-part,.hint-motion-partial_construction_preview path{stroke-dasharray:8 6;animation:hint-trace 3s linear 1}.hint-motion-principle_diagram svg,.hint-motion-angle_groups svg,.hint-motion-equation_groups svg{animation:hint-pulse 2s ease-in-out 2}
@keyframes hint-pulse{0%,100%{opacity:1}50%{opacity:.35}}@keyframes hint-zoom{0%,100%{transform:scale(1)}50%{transform:scale(1.15)}}@keyframes hint-left{0%,100%{transform:translateX(0)}45%,70%{transform:translateX(-65px)}}@keyframes hint-right{0%,100%{transform:translateX(0)}45%,70%{transform:translateX(65px)}}@keyframes hint-rotate{0%,100%{transform:rotate(0)}45%,70%{transform:rotate(var(--hint-angle))}}@keyframes hint-trace{from{stroke-dashoffset:80}to{stroke-dashoffset:0}}
@media(prefers-reduced-motion:reduce){.hint-visual *{animation:none!important}}

@keyframes hint-position{0%,100%{transform:translate(0,0)}45%,70%{transform:translate(var(--hint-dx),var(--hint-dy))}}

.account-page{width:min(540px,calc(100% - 32px));margin:60px auto;padding:32px}.account-page form{display:grid;gap:16px}.account-page details{margin-top:20px}.account-page [role=alert]{color:#a13535;min-height:1.5em}.account-admin-actions{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0}.teacher-page>section.panel{padding:24px;margin:20px 0}.teacher-page table{width:100%;text-align:left;border-collapse:collapse}.teacher-page td,.teacher-page th{padding:12px;border-bottom:1px solid #e5edf0}.member-option{display:flex;align-items:center;gap:10px;margin:12px 0}.assignment-panel{padding:24px;margin:24px 0}.assignment-panel>div{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:14px 0}@media(max-width:700px){.site-header{flex-wrap:wrap;gap:10px}.site-header nav{order:3;width:100%;flex-wrap:wrap}.site-header>.button{font-size:12px}.account-page{margin:24px auto;padding:24px}}

.admin-view-switch{display:flex;gap:6px;flex-wrap:wrap}.preview-notice{margin:12px auto;padding:12px 18px;max-width:1280px;background:#fff5d9;border:1px solid #efd99c;border-radius:12px;color:#604c22}.result-analysis svg{max-width:100%;max-height:260px}.result-analysis{border-left:3px solid #6b8cdd;padding-left:14px}@media(max-width:600px){.admin-view-switch{width:100%}.admin-view-switch .button{flex:1}.preview-notice{margin:10px 12px}}
.reasoning-panel .panel-heading{margin-bottom:10px}.reasoning-panel textarea{display:block;width:100%;min-height:180px;resize:vertical;font:inherit;line-height:1.6}.reasoning-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}.reasoning-actions .button{flex:1 1 140px;min-height:44px}.help-notice{margin:10px 0 0;padding:10px 12px;border-radius:10px;background:#f4f1ff;font-size:14px}.reasoning-record{white-space:pre-wrap;margin:6px 0}
.teacher-summary{margin:16px 0}.teacher-summary .teacher-metrics{display:grid;grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:12px}.metric-tile{display:grid;gap:4px}.metric-tile strong{font-size:26px}.metric-tile small{color:var(--muted,#6b7a89);font-size:12px}.summary-columns{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:12px;margin-top:12px}.level-bars{display:grid;gap:6px;margin:8px 0}.level-bar{display:grid;grid-template-columns:28px 1fr 28px;align-items:center;gap:8px;font-size:13px}.level-bar i{display:block;height:10px;border-radius:6px;background:#8b7ff0;min-width:2px}.stuck-list{list-style:none;margin:8px 0;padding:0;display:grid;gap:6px}.stuck-list li{display:grid;grid-template-columns:1fr auto auto;gap:8px;align-items:baseline}.feedback-item{border:1px solid #e1e8ef;border-radius:12px;padding:12px;margin:10px 0}.feedback-item header{margin-bottom:6px}.issue-options{display:grid;gap:6px;margin:8px 0}@media(max-width:640px){.teacher-summary .teacher-metrics{grid-template-columns:1fr 1fr}}
.classroom-page .panel{margin:14px 0}.class-card header{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px}.class-columns{display:grid;grid-template-columns:minmax(180px,1fr) minmax(260px,2fr);gap:18px}.class-columns h4{margin:0 0 8px}.student-list{list-style:none;margin:0 0 8px;padding:0;display:grid;gap:6px;max-height:220px;overflow:auto}.student-list li{display:flex;justify-content:space-between;gap:8px;padding:6px 10px;border-radius:10px;background:#f4f8fb}.assigned-row{display:grid;grid-template-columns:96px 1fr;gap:12px;align-items:center;padding:8px 0;border-bottom:1px solid #e7eef4}.assigned-row p{margin:2px 0}.mini-figure{width:96px;height:72px;overflow:hidden;border-radius:10px;background:#f4f8fb}.mini-figure svg,.bank-card .task-figure svg,.task-preview-figure svg{width:100%;height:100%;display:block}.filter-chips{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.bank-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px}.bank-card{text-align:left;cursor:pointer;border:1px solid #dbe7ef;background:#fff;border-radius:16px;padding:12px;display:grid;gap:6px;font:inherit;color:inherit}.bank-card:hover,.bank-card:focus-visible{border-color:var(--blue,#3887fb);outline:none;box-shadow:0 0 0 3px rgba(56,135,251,.18)}.bank-card .task-figure{height:120px;overflow:hidden;border-radius:10px;background:#f4f8fb}.bank-card .task-figure img{width:100%;height:100%;object-fit:contain}.bank-card h3{margin:2px 0;font-size:16px}.bank-card p{margin:0;color:#5b6f86;font-size:13px}.task-preview{display:grid;grid-template-columns:minmax(200px,1fr) minmax(220px,1fr);gap:16px}.task-preview-figure{min-height:200px;border-radius:12px;background:#f4f8fb;padding:8px}.task-preview-text h3{margin:0 0 8px}@media(max-width:700px){.class-columns,.task-preview{grid-template-columns:1fr}.bank-grid{grid-template-columns:1fr 1fr}}
/* 2026-10-11 (Codex task 11): on a narrow screen the header's nav is an overlay strip below the 81px header; the workspace had lost the
   top clearance the other pages keep, so the nav covered the "记录" button. Keep the clearance. */
@media(max-width:800px){.revised-workspace{padding-top:54px}}
/* A low viewport (a phone with its keyboard open): the sticky bottom bar must not sit on top of the reasoning box. */
@media(max-height:520px){.workspace-submit.global-actions{position:static}}
/* The character counter sits at the bottom right of the reasoning box. */
#scratch-count{display:block;text-align:right;margin-top:2px}

/* Small "i" notes beside the help / check / submit buttons */
.action-with-tip{display:inline-flex;align-items:center;gap:6px}
.info-tip{position:relative;display:inline-block;vertical-align:middle}
.info-tip>summary{list-style:none;cursor:pointer;width:26px;height:26px;border-radius:50%;border:1px solid #9bb4c8;background:#fff;color:#386baa;display:inline-flex;align-items:center;justify-content:center;font-size:15px;line-height:1}
.info-tip>summary::-webkit-details-marker{display:none}
.info-tip>summary:focus-visible{outline:2px solid #498de0;outline-offset:2px}
.info-tip-body{position:absolute;z-index:30;bottom:calc(100% + 8px);left:50%;transform:translateX(-50%);width:min(290px,78vw);padding:10px 12px;border-radius:10px;background:#fff;border:1px solid #dae5ec;box-shadow:0 6px 20px #20324a22;font-size:13px;line-height:1.55;color:#20324a;font-weight:400;text-align:left}
.info-tip-right .info-tip-body{left:auto;right:0;transform:none}
.submit-control{margin-left:auto;display:inline-flex;align-items:center;gap:8px}
.reasoning-actions{display:flex;flex-wrap:wrap;align-items:center;gap:12px}

.privacy-notice h4{margin:14px 0 4px;font-size:15px}
.privacy-notice ul{margin:0;padding-left:20px;display:grid;gap:4px}
.privacy-notice .privacy-lead{padding:10px 12px;border-radius:10px;background:#f1f8f4;border:1px solid #cfe5d8}

/* D24-01: the submit control belongs in the right-hand column of the three-column bottom bar */
.global-actions>.submit-control{grid-column:3;justify-self:end;margin-left:0}
/* D24-02: on a phone the notes become a sheet pinned to the viewport edges instead of a bubble centred on a small button */
@media(max-width:640px){.info-tip-body,.info-tip-right .info-tip-body{position:fixed;left:12px;right:12px;bottom:84px;top:auto;width:auto;max-width:calc(100vw - 24px);transform:none}}